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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.

4. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   The uppermost counterbore tools shown in the image are the same device. The smaller top item is an insert, the middle shows another three-fluted counterbore insert, assembled in the holder. The shank of this holder is a Morse taper, although there are other machine tapers that are used in the industry.

5. Hidden Uses for Common Household Products Most People Don't ...

   www.aol.com/finance/hidden-uses-common-household...

   1. Tennis Ball. Tennis balls are so useful that you may want to buy some to keep around the house even if you don’t play. For example, half a tennis ball can help screw open tight caps.

6. Drill bit shank - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_shank

   It is a self-locking (or self holding) taper of approximately 5/8" per foot [3] that allows the torque to be transferred to the drill bit by the friction between the taper shank and the socket. The tang at the end of the taper provides a positive drive of the drill when the taper fails to grip. [ 4 ]

7. Cold plunge or a hot bath? New study suggests which has more ...

   www.aol.com/cold-plunge-hot-bath-study-110000608...

   For people trying a cold soak for the first time, 5 minutes can be beneficial. Whether you’re a fan of cold or hot, experiment and keep track of which temperature soak helps you recover the ...